Presented here are 32 trend-setting projects of this century, divided into the six major multi-family housing categories: tower, slab, block, party-wall, detached and semi-detached, and rowhouse. Designed by such masters as Frank Lloyd Wright, Le Corbusier, Mies van der Rohe, and Alvar Aalto, they range from single-house clusters to row-houses, terrace houses, party-wall and large-courtyard housing, to urban high-rise towers and slabs.